An aging water tank plummeted nine stories from a Chicago building Wednesday, releasing “a tidal wave” of water and debris, one witness said, that injured three people and poured water into a nearby day care center. Of the three victims taken to the hospital one was critically injured, the Sun-Times reported, when the wooden tower, 8 feet across and 12 feet high, fell from the top of 2800 N. Pine Grove Ave.

The building failed a Department of Buildings inspection in 2010, for reasons including issues with the water tank’s steel bands. It passed an annual inspection later that year, according to the Department of Buildings’ online records.